import jdbc.DBUtil;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;

public class JDBCDemo8 {
    public static void main(String[] args) throws SQLException {
        Scanner scanner = new Scanner(System.in);
        System.out.println("欢迎登录");
        System.out.println("请输入用户名:");
        String username= scanner.nextLine();
        System.out.println("请输入密码:");
        String password =scanner.nextLine();

        try(Connection connection= DBUtil.getConnection();){
            String sql="SELECT id,username,password,nickname,age " +
                    "FROM user " +
                    "WHERE username=? " +
                    "AND password=?";
            //先将sql语句发送给数据库,让其理解意思
            PreparedStatement ps =connection.prepareStatement(sql);
            ps.setString(1,username);
            ps.setString(2,password);

            ResultSet rs=ps.executeQuery();
            if (rs.next()){
                System.out.println("登录成功");
                System.out.println("欢迎回来:"+rs.getString("nickname"));
            }else {
                System.out.println("登录失败");
                System.out.println("用户名或密码错误");
            }
        }

    }
}
